Professional-grade accuracy Measurement: This Decibel Meter features a highly sensitive and precise condenser microphone that is capable to measure noise levels from 30 to 130 dB with an accuracy of 1.5 dB. it has a 0.5s response time . Need to testa noise source in your neighborhood or at work is dangerously loud ? Use this decibel meters to get convincing data. Larger Backlit LCD Display: The decibel meter has a wide LCD backlit screen with analog bar graph, clearly display the noise level, convenient for users to quickly capture noise information. The built-in flashlight on the back for nighttime use Auto Power Off & Overload Indication: The MAX /Min hold function is able to freeze the max recording, allows you to easily record the maximum /minimum values between 30~130dB during the measurement time. over-range measurement warning sign is designedfor reminding you that the sound is too loud out of measuring range. More Intelligent Functions10 Minutes without operation Automatic power off function plays an important part in eliminating waste of electricity. Furthermore,low power indication is designed to remind you to replace battery in time.